Display apparatus

ABSTRACT

The present disclosure relates to a display apparatus, especially having a display panel generating sounds. A display apparatus according to the present disclosure includes: a display module; a back cover at a rear surface of the display module; a compartment provided inside the back cover; a fixing element provided inside the compartment; a sound generating unit inserted into the compartment and installed by the fixing element; and an adhesive element attaching an upper surface of the sound generating unit and the rear surface of the display module.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of the Korean Patent Application No.10-2019-0081990 filed on Jul. 8, 2019, which is hereby incorporated byreference as if fully set forth herein.

BACKGROUND Technical Field

The present disclosure relates to a display apparatus, especially havinga display panel generating sounds.

Discussion of the Related Art

In general, the display apparatus is used as a screen to display visualinformation such as a television, a monitor, a laptop computer, a smartphone, a tablet computer, an electronic pad wearable device, a watchphone, a portable information device, a navigation system or anelectronic products, a vehicle control display device or the homeappliances.

A general display apparatus may include a display panel for representinga video image, and an audio device for providing sounds related to thevideo image.

However, the conventional display apparatus has a limitation in whichsound quality deteriorates due to interference between sounds reflectedfrom a wall or the floor because the sounds output from the sound deviceproceed to the rear or bottom side of the display panel. Therefore, itis difficult to accurately provide the sound to the viewers, so that theimmersion of viewers may be deteriorated.

SUMMARY

The inventors of the present disclosure recognized problems with arelated display apparatus and conducted various experiments to improvethe sound quality and to provide the sound to the front direction of thedisplay panel when viewers see an image in front of the display panel.After a number of experiments, the inventors can provide a displayapparatus having a new structure capable of generating sounds that canproceed in front of the display panel and improving the sound quality.

Accordingly, embodiments of the present disclosure are directed to adisplay apparatus that substantially obviates one or more of theproblems due to limitations and disadvantages of the related art.

An aspect of the present disclosure is to provide a display apparatusaccurately suggesting sounds. Another aspect of the present disclosureis to provide a display apparatus generating sounds proceeding to thefront direction of the display panel.

Still another aspect of the present disclosure is to provide a displayapparatus improving the sound quality and increasing viewer immersion. Afurther aspect of the present disclosure is to provide a soundgenerating unit constructed in a modular type and to provide a displayapparatus having a structure that may be mounted in a back cover in asimple assembly process.

Yet another aspect of the present disclosure is to provide a displayapparatus having a modular sound generating unit that may provideimproved sound quality, can easily mount any additional elementsensuring a rich sound volume and quality, and may be easy to repair andreplace.

Additional features and aspects will be set forth in the descriptionthat follows, and in part will be apparent from the description, or maybe learned by practice of the inventive concepts provided herein. Otherfeatures and aspects of the inventive concepts may be realized andattained by the structure particularly pointed out in the writtendescription, or derivable therefrom, and the claims hereof as well asthe appended drawings.

To achieve these and other aspects of the inventive concepts, asembodied and broadly described, a display apparatus comprises: a displaymodule; a back cover disposed at a rear surface of the display module; acompartment provided inside the back cover; a fixing element providedinside the compartment; a sound generating unit inserted into thecompartment and installed by the fixing element; and an adhesive elementattaching an upper surface of the sound generating unit and the rearsurface of the display module.

In one embodiment, the back cover includes: an upper substrate facing tothe rear surface of the display module; a lower substrate apart from theupper substrate with a predetermined distance; and a plurality ofpartition walls disposed between the upper substrate and the lowersubstrate. The compartment is divided by the partition walls into aplurality of the compartments.

In one embodiment, the sound generating unit is inserted into thecompartment from a top surface of the compartment, and a bottom surfaceof the compartment is joined with bottom of the sound generating unit bythe fixing element.

In one embodiment, the sound generating unit include: a unit housing;and a vibration unit mounted inside the unit housing. An upper surfaceof the vibration unit is attached to the rear surface of the displaymodule by the adhesive element.

In one embodiment, the display apparatus further comprises: a resonancepath connecting an inner space of the unit housing and the compartment.

In one embodiment, the display apparatus further comprises: a weightelement attached inside the unit housing.

In one embodiment, the adhesive element is deposited overall of the rearsurface of the display module. An upper surface of the unit housing, anupper surface of the vibration unit and a top surface of the uppersubstrate of the back cover are attached to the display module by theadhesive element.

In one embodiment, an upper surface of the unit housing is disposed at asame level with or at higher level from an upper surface of the uppersubstrate. The adhesive element is deposited on the upper surface of theunit housing and the upper surface of the vibration unit.

In another aspect, a display apparatus comprises: a sound generatingunit including a vibration unit installed in a unit housing; a backcover including a compartment where the sound generating unit isinserted, and a fixing element provided inside the compartment forinstalling the sound generating unit; and a display module disposed at atop surface of the back cover and attached to an upper surface of thevibration unit.

In one embodiment, the display module includes: a display panelincluding a display area and a non-display area surrounding the displayarea; a functional film disposed at an outer upper surface of thedisplay panel; and a heat dissipate element disposed at a rear surfaceof the display panel. The display apparatus further comprises: anadhesive element attaching the upper surface of the vibration unit tothe heat dissipate element.

In one embodiment, the display apparatus further comprises: a guidepanel surrounding sides of the back cover and the display module, andassembling the back cover with the display module.

In one embodiment, the sound generating unit further includes: a weightelement installed at circumference of the vibration unit inside the unithousing.

In one embodiment, the unit housing includes: a bottom surface; a topsurface facing the bottom surface and having an aperture; and a sidesurface connecting the bottom surface and the top surface. The soundgenerating unit is installed on the bottom surface by the fixingelement.

In one embodiment, the unit housing further includes: a resonanceopening formed at one portion of the side surface for exposing an innerspace of the unit housing.

In one embodiment, the vibration unit includes: a base plate havingvessel shape and fixed inside the unit housing; a magnet having acylindrical shape and fixed at a center portion of the base plate; abobbin apart from the magnet and surrounding the magnet; a coilsurrounding the outer circumference of the bobbin; a bobbin protectorattached at the upper portion of the bobbin; and a damper connecting atleast one of the bobbin and the bonnin protector to the base plate. Anupper surface of the bobbin protector is attached to the display module.The emission area includes the plurality of aperture areas defined bythe bank.

In one embodiment, the back cover includes: an upper substrate; a lowersubstrate facing the upper substrate with a predetermined distance; aplurality of partition walls disposed between the upper substrate andthe lower substrate; and a plurality of compartments surrounded by thepartition walls. The sound generating unit inserted in the compartmentthrough a mounting hole formed by removing some of the upper substrateand installed at the lower substrate.

In one embodiment, the compartment have any one shape, in a plan view,of a square, a rectangle, a regular hexagon, a regular octagon, a circleand an oval.

In one embodiment, the display apparatus further comprises: a resonancepath connecting an inner space of the unit housing and a space of thecompartment.

According to an example of the present disclosure, it is possible toprovide a display apparatus accurately generating and transmitting thesounds, improving the sound quality, and increasing immersion ofviewers. According to another example of the present disclosure, it ispossible to provide a display apparatus generating sounds to the frontof the display panel. In particular, as the back cover attached to therear surface of the display module may include compartment formedbetween two substrate, the back cover may have a light weight and astrengthen structure. In addition, the sound generating unit may beinserted into the compartment formed by the partition walls, so that thepresent disclosure may provide a display apparatus with a built-inspeaker function without increasing thickness of the flat displayapparatus.

In addition, as further comprising a weight element to the soundgenerating unit inserted into the back cover, the elevation movement ofthe bobbin generating the vibration may be ensured. As furthercomprising a resonance path connecting the space formed by the soundgenerating unit and the space formed by the compartment, a high qualitysound may be provided.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the inventive concepts asclaimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiments of the disclosure andtogether with the description serve to explain principles of thedisclosure. In the drawings:

FIG. 1 is a diagram illustrating a display apparatus having a soundgenerating unit at the rear surface according to the present disclosure.

FIG. 2 is a cross-sectional view, cutting along I-I′ in FIG. 1,illustrating a structure of the display apparatus according to the firstembodiment of the present disclosure.

FIG. 3 is an enlarged cross-sectional view of circled portion of FIG. 2,illustrating a structure of vibration generating unit in the displayapparatus according to the first embodiment of the present disclosure.

FIG. 4 is an enlarged cross-sectional view illustrating a structure of adisplay apparatus according to the second embodiment of the presentdisclosure.

FIG. 5 is a cross-sectional view illustrating a structure in which aunit housing having a resonance opening is inserted inside the backcover of the display apparatus according to the second embodiment of thepresent disclosure.

FIG. 6 is an enlarged cross-sectional view illustrating a structure of adisplay apparatus according to the third embodiment of the presentdisclosure.

FIG. 7 is a perspective view illustrating one example of a shape of achamber and a unit housing installed in the chamber, according to thepresent disclosure.

FIG. 8 is a plane view illustrating one example of a shape of a chamberand a unit housing installed in the chamber, according to the presentdisclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE

Reference will now be made in detail to the exemplary embodiments of thepresent disclosure, examples of which are illustrated in theaccompanying drawings. Wherever possible, the same reference numberswill be used throughout the drawings to refer to the same or like parts.In the specification, it should be noted that like reference numeralsalready used to denote like elements in other drawings are used forelements wherever possible. In the following description, when afunction and a configuration known to those skilled in the art areirrelevant to the essential configuration of the present disclosure,their detailed descriptions will be omitted. The terms described in thespecification should be understood as follows. Advantages and featuresof the present disclosure, and implementation methods thereof will beclarified through following embodiments described with reference to theaccompanying drawings. The present disclosure may, however, be embodiedin different forms and should not be construed as limited to theembodiments set forth herein. Rather, these embodiments are provided sothat this disclosure will be thorough and complete, and will fullyconvey the scope of the present disclosure to those skilled in the art.Further, the present disclosure is only defined by scopes of claims.

A shape, a size, a ratio, an angle, and a number disclosed in thedrawings for describing embodiments of the present disclosure are merelyan example, and thus, the present disclosure is not limited to theillustrated details. Like reference numerals refer to like elementsthroughout. In the following description, when the detailed descriptionof the relevant known function or configuration is determined tounnecessarily obscure the important point of the present disclosure, thedetailed description will be omitted.

In the case that “comprise,” “have,” and “include” described in thepresent specification are used, another part may also be present unless“only” is used. The terms in a singular form may include plural formsunless noted to the contrary.

In construing an element, the element is construed as including an errorrange although there is no explicit description.

In describing a positional relationship, for example, when thepositional order is described as “on,” “above,” “below,” and “next,” thecase of no contact there-between may be included, unless “just” or“direct” is used. If it is mentioned that a first element is positioned“on” a second element, it does not mean that the first element isessentially positioned above the second element in the figure. The upperpart and the lower part of an object concerned may be changed dependingon the orientation of the object. Consequently, the case in which afirst element is positioned “on” a second element includes the case inwhich the first element is positioned “below” the second element as wellas the case in which the first element is positioned “above” the secondelement in the figure or in an actual configuration.

In describing a temporal relationship, for example, when the temporalorder is described as “after,” “subsequent,” “next,” and “before,” acase which is not continuous may be included, unless “just” or “direct”is used.

It will be understood that, although the terms “first,” “second,” etc.may be used herein to describe various elements, these elements shouldnot be limited by these terms. These terms are only used to distinguishone element from another. For example, a first element could be termed asecond element, and, similarly, a second element could be termed a firstelement, without departing from the scope of the present disclosure.

In describing the elements of the present disclosure, terms such as thefirst, the second, A, B, (a) and (b) may be used. These terms are onlyto distinguish the elements from other elements, and the terms are notlimited in nature, order, sequence or number of the elements. When anelement is described as being “linked”, “coupled” or “connected” toanother element that element may be directly connected to or connectedto that other element, but indirectly unless otherwise specified. It isto be understood that other elements may be “interposed” between eachelement that may be connected to or coupled to.

It should be understood that the term “at least one” includes allcombinations related with any one item. For example, “at least one amonga first element, a second element and a third element” may include allcombinations of two or more elements selected from the first, second andthird elements as well as each element of the first, second and thirdelements.

Features of various embodiments of the present disclosure may bepartially or overall coupled to or combined with each other, and may bevariously inter-operated with each other and driven technically as thoseskilled in the art can sufficiently understand. The embodiments of thepresent disclosure may be carried out independently from each other, ormay be carried out together in a co-dependent relationship.

The ‘display apparatus’ in this application may comprise a liquidcrystal module (LCM), an organic light emitting display module (OLEDModule), or a quantum dot module (QD Module) which are have a displaypanel and a driver for driving the display panel. The ‘displayapparatus’ may further comprise a complete product or final productincluding LCM, OLED Module or QD Module such as a note-book computer, atelevision set, a computer monitor, an equipment apparatus having anautomotive apparatus or other modules for vehicle, a set electronicapparatus or a set device (or set apparatus) such as a smart phone or amobile electronic apparatus.

Therefore, the ‘display apparatus’ may be any one of a display devicesuch as LCM, OLED Module and QD Module, an application device includingLCM, OLED Module or QD Module, or a set apparatus for end user's finaldevices.

In another example, the LCM, OLED Module or QD Module may be referred tothe ‘display apparatus’, and the final electronic devices including LCM,OLED Module or QD Module may be referred to the ‘set apparatus’. Forexample, the display apparatus may include a display panel of liquidcrystal display or organic electroluminescence display, and a sourceprinted circuit board (PCB) for driving the display panel. The setapparatus may include the display apparatus and a set PCB or control PCBfor driving the set apparatus itself by connecting to the displayapparatus and the source PCB.

The display panel according to the embodiments of the present disclosuremay include a liquid crystal display panel, an organic light emittingdiode display panel, and an electroluminescent display panel, but it isnot limited thereto. For example, display panel may have any structurein which the display panel may be vibrated to generate sound. Inaddition, the display panel applied to the display apparatus accordingto the embodiment of the present disclosure is not limited to the shapeor size of the display panel.

In the case that the display panel is the liquid crystal display panel,the display panel may include a plurality of gate lines, a plurality ofdata lines, and a plurality of pixels (or sub pixels) defined by thegate lines and the data lines. The display panel may include an arraysubstrate including thin film transistor as a switching element forcontrolling the light transmittance of each pixel, an upper substrateincluding a color filter and/or a black matrix, and a liquid crystallayer disposed between the array substrate and the upper substrate.

In the case that the display panel is an organic light emitting diodedisplay panel, the display panel may include a plurality of gate lines,a plurality of data lines, and a plurality of pixels (or sub pixels)defined by the gate lines and the data lines. The display panel mayinclude an array substrate including thin film transistor for applyingthe electric voltage to each pixel selectively, an organic lightemitting layer on the array substrate, and an encapsulation substratedisposed on the array substrate for covering the organic light emittinglayer. The encapsulation substrate may protect the thin film transistorand the organic light emitting layer from any external shocks, andprevent moisture and oxygen from penetrating into the organic lightemitting layer. In addition, the organic light emitting layer formed onthe array substrate may be replaced by the inorganic light emittinglayer, the quantum dot light emitting layer, or the micro light emittingdiode element.

The display apparatus including the sound generating module according tothe present disclosure may be applied to the vehicle as the userinterface module such as the central control panel in the automobile.For example, the display panel may be installed at the center fasciabetween the driver seat and the assistant seat so that the vibration ofthe display panel propagates toward the interior space of the vehicle.Therefore, the in-car audio can be improved compared to havingconventional speakers only at inside sides of the car.

Hereinafter, an example of a display apparatus according to the presentdisclosure will be described in detail with reference to theaccompanying drawings. In designating reference numerals to elements ofeach drawing, the same components may have the same reference numeralsas much as possible even though they are shown in different drawings.Scale of the elements shown in the accompanying drawings have adifferent scale from the actual for convenience of description, it isnot limited to the scale shown in the drawings.

FIG. 1 is a diagram illustrating a display apparatus having a soundgenerating unit at the rear side according to the present disclosure.Referring to FIG. 1, the display apparatus according to the presentdisclosure may output acoustics or sounds PVS in accordance withvibration of a display module 100 for representing image data. Forexample, in a display apparatus, the display module 100 may be vibratedby the sound generating unit 500 to output sounds PVS. Most of thesounds PVS generated by the vibration of the display module 100 may bedirectly output toward the front of the screen FD of the displayapparatus. The display apparatus according to the present disclosure canuse the display module 100 as a diaphragm for generating sounds PVS andoutputting the sounds PVS to the front of the screen FD of the displaymodule 100. Accordingly, the sounds can be accurately transmitted to theviewers and the sound quality can be improved, and the immersion ofviewers can be enhanced.

In the display apparatus according to the present disclosure, the soundgenerating unit 500 provides vibration forces to the display module 100,and the display module 100 vibrates to make sound. The display module100 may be formed of a substrate easily vibrated such as a large areaglass substrate, and may include a back cover for supporting the displaymodule 100 on the rear surface of the display apparatus. Installing thevibration generating device to the rear surface of the display module100 by replacing with the speaker used in the related arts, the presentdisclosure may provide a structure for maintaining the thickness of thewhole display apparatus including the display module 100 in a very thinthickness. Hereinafter, referring to figures, various embodiments of thepresent disclosure will be described in detail.

First Embodiment

FIG. 2 is a cross-sectional view, cutting along I-I′ in FIG. 1,illustrating a structure of the display apparatus according to the firstembodiment of the present disclosure. FIG. 3 is an enlargedcross-sectional view of circled portion of FIG. 2, illustrating astructure of vibration generating unit in the display apparatusaccording to the first embodiment of the present disclosure.

Referring to FIG. 2, the display apparatus according to the firstembodiment of the present disclosure may comprise a display module 100,a back cover 300 and a sound generating unit 500. The sound generatingunit 500 may have a structure of being inserted and fixed into the backcover 300.

The display module 100 may include a display panel 110, a functionalfilm 130 and a heat diffusion element 150. The display panel 110 may beimplemented as various types of the display. The display panel 110 mayvibrate in response to the vibration of the sound generating unit 500 todirectly output the sounds PVS to the front direction FD. For example,when display module 100 plays role for generating the sounds PVS, thedisplay module 100 may be a diaphragm, a panel speaker or a flat speakerthat directly generates the sounds PVS.

In one example, the display panel 110 may include a pixel circuitdisposed on a substrate (or base substrate), and a pixel array layer (ordisplay unit) connected to the pixel circuit and having an anodeelectrode, a cathode electrode and an organic emission layer. Thedisplay panel 110 may display an image in a top emission type, a bottomemission type or a dual emission type according to the structure of thepixel array layer. The anode electrode may be expressed as a firstelectrode or a pixel electrode, but it is not limited to this term. Thecathode electrode may be expressed as a second electrode or a commonelectrode, but it is not limited to this term.

The functional film 130 may include an anti-reflection layer (oranti-reflective film) for preventing ambient light reflection andimproving outdoor visibility and contrast ratio for an image displayedon the display panel 110. For example, the anti-reflection layer may bea circular polarized layer (or circular polarization film) that preventsreflected light from being reflected by thin film transistors and/orlines disposed at the pixel array layer of the display panel 1100 to theviewers. Although not shown in figures, the functional film 130 may beattached on the display panel 110 using a transparent adhesive layer.

In one example, the functional film 130 may further include a light pathcontrol layer (or an optical film) that adjusts a path of light emittedfrom the pixel array layer of the display panel 110 toward viewers. Thelight path control layer may include a structure in which a highrefractive layer and a low refractive layer are alternately stacked,thereby the path of light incident from the pixel array layer may bechanged to minimize the color shift phenomena according to the viewingangle. In this case, the low refractive layer may be disposed at thetopmost layer of the light path control layer.

In one example, the display module 100 may further include a touchelectrode unit for user interface using a user's touch. The touchelectrode unit may be inserted between the display panel 110 and thefunctional film 130 or embedded into the display panel 110 for thein-cell touch type. For example of the in-cell touch type, the touchelectrode unit may include the touch electrodes of the mutualcapacitance type or the self-capacitance type.

The heat diffusion element 150 may have a thin sheet shape adhered tothe whole rear surface of the display panel 110. The heat diffusionelement 150 may be disposed on the rear surface of the display module100 so as to overlap with the sound generating unit 500, thereby theheat generated when the sound generating unit 500 is operated may bediffused toward the display module 100. Accordingly the performancedegradation of the sound generating unit 500 caused by the heat can beprevented. In addition, the heat diffusion element 150 may have a sizecorresponding to the whole rear surface of the display panel 110 todiffuse the heat generated, when the sound generating unit 500 isoperated, to the wider areas. Accordingly, it is possible to prevent theheat from being intensively concentrated to a local area of the displaymodule 100 overlapping with the sound generating unit 500, thereby thelocal luminance non-uniformity of the display module 100 can beminimized or prevented.

For example, the heat diffusion element 150 may include a materialhaving high thermal conductivity such as any one material of aluminum(Al), copper (Cu), silver (Ag) and magnesium (Mg) or an alloy of them,but it is not limited thereto.

The back cover 300 may be disposed on the rear surface of the displaymodule 100. The back cover 300 may mount or fix the sound generatingunit 500 therein.

In one example, the back cover 300 may cover the rear surface of thedisplay module 100. The back cover 300 may be expressed as a supportingmember, a housing, a system cover, a set cover, a rear cover, a coverbottom, a back frame, or chassis, but it is not limited thereto. Therear surface of the display module 100 may be expressed as one side, afirst side, a back surface or a lower surface, but it is not limitedthereto.

The back cover 300 may be attached to the rear surface of the displaymodule 100 with an adhesive element 600. The adhesive element 600 mayinclude a pressure sensitive adhesive (PSA), an optical clear adhesive(OCA) or an optical clear resin (OCR), but it is not limited thereto.Attached with whole of the rear surface of the display module 100, theback cover 300 may function for protecting the rear surface of thedisplay module 100 from any external shocks and for dissipating the heatgenerated from the display module 100.

In one example, the back cover 300 may have a plate shape covering thewhole rear surface of the display module 100, i.e., the entire rearsurface of the heat diffusion element 150. In some examples, the edgeportions or the corner portions of the back cover 300 may have a slopedshape or a curved shape by chamfering or rounding process.

Hereinafter, further referring to FIG. 3, the back cover 300 will beexplained in detail. Referring to FIGS. 2 and 3, the back cover 300 mayinclude a lower substrate 310, an upper substrate 330, a partition wall350 and a compartment 370. The back cover 300 may further include afixing element 400 for installing the sound generating unit 500, on asurface portion of the lower substrate 310 forming the compartment 370.

The lower substrate 310 may have a thin plate structure. The uppersubstrate 330 may be facing and joined with the lower substrate 310 witha predetermined distance. A plurality of partitions 350 may be insertedbetween the lower substrate 310 and the upper substrate 330, to keep thegap between the lower substrate 310 and the upper substrate 330 inconstant. The plurality of partition walls 350 may be arranged byconnecting each other on the lower substrate 310, so that thecompartment 370 may be arranged to have a planar shape such as a square,a rectangle, a regular hexagon, a regular octagon, a rhombus, a circle,and oval or an irregular polygon on the top view.

By providing a defined compartment 370 surrounded by the partition walls350 between the lower substrate 310 and the upper substrate 330 asdescribed above, it is possible to accomplish a structure enhancing thestrength and reducing the weight of the back cover 300. As the size ofthe compartment 370 is reduced, the weight of the back cover 300increases, but the rigidity may be maintained more strongly. As the sizeof the compartment 370 is increased, the weight of the back cover 300decreases, but the rigidity may be slightly weakened. Considering thistrade-off relationship, the thickness of the partition wall 350 and/orthe space size of the compartment 370 may be appropriately set inaccordance with the size and required rigidity of the display panel.

The present disclosure provides a structural feature to mount the soundgenerating unit 500 inside the compartment 370. Therefore, it ispreferable that the size of the compartment 370 has a sufficient surfacearea and/or volume to contain the sound generating unit 500. However,when it is necessary to increase the rigidity of the back cover 300, thesize of the compartment 370 may be designed to be much smaller than thesound generating unit 500. For example, there may be a case in which thesize of the partition wall 370 is reduced and the thickness of thepartition wall 350 is thickened or the number of the partition walls 350is increased. In this case, only a few compartments 370 corresponding tothe number of sound generating units 500 may have a size sufficient tomount the sound generating units 500, and the rest of the compartments370 may be set to a small size for ensuring the rigidity.

Further, referring to FIG. 3, the structure of the sound generating unit500 and the arrangement relationship fixed inside the back cover 500will be described in detail.

The sound generating unit 500 may include a unit housing 510 and avibration unit 530. The vibration unit 530 may be fixed inner space ofthe unit housing 510. Therefore, the unit housing 510 may havesufficient volume for enclosing or mounting the vibration unit 530.

The unit housing 510 may include a bottom surface 511, a top surface 513and a side surface 515. The bottom surface 511 may be a bottom plate ofthe unit housing 510 for fixing or installing the vibration unit 530thereon. In addition, the bottom surface 511 may be fixed inside theback cover 300. The top surface 513 may be a top plate facing the bottomsurface 511 with a predetermined distance. The top surface 513 may havean aperture. Through this aperture, the vibration unit 530 may beinstalled on or disassembled from the bottom surface 511. The sidesurface 515 may be a side plate for connecting the bottom surface 511and the top surface 513 for protecting the inner space of the unithousing 510.

The unit housing 510 may be made of various materials. After making thebottom surface 511, the top surface 513 and the side surface 515respectively, they are assembled each other. Otherwise, using a mold,the unit housing 510 may be imprinted as a vessel having a “U” shape. InFIG. 3, the aperture formed at the top surface 513 has a smaller areathan the area of the top surface 513, but it is not limited thereto. Inother case, the aperture may be same area with the top surface 513.Further, the top surface 513 may be extruded outward from the sidesurface 515 as shown in FIG. 2, or the top surface 513 may be extrudedinnerward from the side surface 515 as shown in FIG. 3.

The vibration unit 530 is a mechanical body that actually generates theacoustic vibration. The vibration unit 530 may be installed inside theunit housing 510 to vibrate the display module 100. The vibration unit530 may be fixed to the unit housing 510 using a fixing element or madeas one body with the unit housing 510. Even though not shown in figures,the fixing element may be an organic adhesive such as epoxy bond or amechanical element such as a screw or hook.

The vibration unit 530 may include any type of sound devices orvibration generating device for vibrating the display module 100 inresponse to the electrical signal. For example, the vibration unit 530may be configured to vibrate the display module 100 according to anapplied electrical current (or voice current) based on Fleming's lefthand rule. The vibration unit 530 may be expressed as a sound generatingunit, a vibration generating module, a vibration generating unit, anactuator, an exciter or a transducer, but it is not limited thereto.

The vibration unit 530 may include an actuator (or exciter) disposed asto contact the rear surface of the display module 100. For example, thevibration unit 530 configured by the actuator may include a base plate531, a magnet 532, a center pole 533, a bobbin 534, a coil 535, an edgeplate 536 and a damper 537.

The base plate 531 disposed or fixed on the unit housing 510 may be amain body of the vibration unit 530. The base plate 531 may support themagnet 532, the center pole 533 and the edge plate 536. The base plate531 may be made of a magnetic metal material such as iron (Fe). The baseplate 531 may be expressed as a lower plate, a base frame or a yoke, butit is not limited thereto.

The base plate 531 may include a groove for receiving the magnet 532 andthe bobbin 534. For example, the groove may be formed to be concave fromthe upper surface of the base plate 531 to have a circular shape.

Even though not shown in drawings, the base plate 531 may be fixed tothe unit housing 510 with a fixing element or be made as one body withthe unit housing 510. The fixing element may be an adhesive element. Forexample, the adhesive element may be an adhesive or a double-side tape,but it is not limited thereto.

In another example, the fixing element may include a screw. The screwmay penetrate the base plate 531 to fasten with the unit housing 510. Inother example, the fixing element may include a bolt and a nut. The nutmay be installed or fixed on the unit housing 510 overlapped with thebase plate 531. The bolt may penetrate the base plate 531 to be joinedwith the nut. In one example, the nut may be a self-clinching nutdisposed at the unit housing 510. The self-clinching nut may be a PEMnut.

The magnet 532, the center pole 533, the bobbin 534 and the coil 535 maybe expressed as a magnetic circuit unit or a self-vibration unitinstalled in the base plate 531 for vibrating the display module 100.

In one example, the magnetic circuit unit may have a structure of anexternal magnetic type or a dynamic type in which the magnet 532 isdisposed outside the coil 535, or an internal magnetic type or amicro-type in which the magnet 532 is disposed inside the coil 535. Thevibration unit 530 including a magnetic circuit unit of internalmagnetic type may have an advantage that a leakage magnetic flux issmall and has a small overall size. The vibration unit 530 according tothe present disclosure may have a structure of an external type orinternal type, and the following description mainly focuses on thestructure of the internal type.

In one example, the magnet 532 may be inserted into the groove of thebase plate 531. The magnet 532 may be permanent magnet having acylindrical shape that can be inserted into the bobbin 534. In oneexample, the magnet 532 may include a sintered magnet such as the bariumferrite, and the material may include at least any one of ferroustrioxide (Fe2O3), barium carbonate (BaCO3), neodymium magnets,magnetically enhanced strontium ferrite (Fe12O19Sr), aluminum (Al),nickel (Ni) and cobalt (Co) or alloy casting magnets of them. Forexample, the neodium magnet may be meodium-iron-boron (Nd—F—B), but itis not limited thereto.

In one example, the bobbin 534 may be disposed on the base plate 531 assurrounding the magnet 532. The bobbin 532 may have a circular shape oroval shape, but it is not limited thereto. The oval shape may include anelliptical shape, a rectangular shape with rounded corners, ornon-circular cured shape having a width different from its height, butit is not limited thereto. For example, in the oval shaped bobbin 534,the ratio of the major axis to the minor axis may be configured as 1.3:1to 2:1. The oval-shaped bobbin 534 may improve the sound of ahigh-pitched tone bandwidth than the circular shaped bobbin, and hasless heat generation due to vibration, and thus may have excellent heatdissipation characteristics.

In one example, the coil 535 may be wounded to surround the outercircumferential surface of the bobbin 534 to receive the electricalcurrent (or voice current) for sound generation from the outside. Thecoil 535 may be lifted together with the bobbin 534. The coil 535 may beexpressed by a voice coil. When a current is applied to the coil 535,the entire bobbin 534 moves up and down according to Fleming's left-handrule based on the applied magnetic field formed around the coil 535 andthe external magnetic field formed around the magnet 532. Then, soundPVS or sound waves may be generated by vibration of the display module100 due to vertical movement (or oscillation, or vibration) of thebobbin 534.

In one example, as the coil 535 is wounded to surround the outercircumferential surface of the bobbin 534, the heat generated in thecoil 535 may be transferred to the bobbin 534 and the heat of the bobbin534 may affect the display panel 110. Due to this heat influence, theimage quality defects may occur. In order to reduce the heat influence,the coil 535 may be made of a material having excellent heat dissipationcharacteristics. In addition, as the bobbin 354 vibrates up and down, apartial oscillation occurs due to the top and bottom vibrations. Thepartial oscillation of the bobbin 534 may be influenced by the weight ofthe bobbin 534, and the weight of the bobbin 534 may be influenced bythe weight of the coil 535. When the weight of the coil 535 is reduced,the partial oscillation of the bobbin 534 may be reduced. Consideringthe heat transmitted to the bobbin 534 and the partial oscillation ofthe bobbin 534, the coil 535 may be made of aluminum having a betterthermal conductivity than copper, which is a material of a general coil,having relatively excellent heat dissipation properties, and beingrelatively lighter than copper.

In addition, aluminum may form an oxide film in the air, so that thesoldering is not easy when the vibration unit 530 is manufactured, sothe coil 535, for example, may have an aluminum layer (or a first metallayer) for heat dissipation and a metal shell layer surrounding thealuminum layer. In this case, the metal shell layer may include any onematerial of copper (Cu), silver (Ag) and gold (Au). For example, thecoil 535 may be a copper clad aluminum wire. As the metal shell layermay be formed in the form of a thin film on the outside of the firstmetal layer, the weight of the coil 535 may not be significantlyaffected. The coil 535 according to one example of the presentdisclosure may have a weight which is about 60% of the weight of thecoil made of copper material or copper wire alone.

In one example, the bobbin 534 may be a structure formed of a materialsuch as pulp or paper, aluminum or magnesium or an alloy thereof, or asynthetic resin such as polyimide. For example, the bobbin 534 may bemade of polyimide film having a relatively excellent heat dissipationproperty and a relatively light weight, in order to prevent local imagequality defects of the display panel 110 due to the heat generated fromthe coil 535.

The polyimide film has the excellent heat resistance, electricalinsulation, flexibility and non-combustibility without changing physicalproperties in a wide temperature range from −273° C. to +400° C. Thepolyimide film has excellent thermal and mechanical strength, so it mayimprove the reliability of the bobbin 534. Due to excellent heatdissipation properties, the heat generated by the vibration of thebobbin 534 may be reduced. For example, the polyimide film may be madeof KAPTON or a combination of pyromellitec dianhydride and4,4′-oxydianiline.

The center pole 533 may be accepted or inserted into the bobbin 534 toguide of the up-down movement of the bobbin 534. For example, the centerpole 533 may be inserted inside the bobbin 534 and the outercircumference of the center pole 533 may be surrounded by the bobbin534. The center pole 533 may be expressed as an elevation guider or apole pieces, but it is not limited thereto.

The edge frame 536 may be disposed at the circumference of the frontsurface of the base plate 531 and support the damper 537. In oneexample, the edge frame 536 may be formed at the circumference of thefront surface of the base plate 531 with a predetermined height to havethe similar shape as the bobbin 534. In another example, the edge frame536 may be formed at the circumference of the front surface of the baseplate 531 with a predetermined height and include a hollow (or cavity)having the same shape as the bobbin 534.

The damper 537 may be disposed between the edge frame 536 and the magnetcircuit unit as to link therebetween. For example, the damper 537 may bedisposed between the edge frame 536 and the bobbin 534. The damper 537may be expressed as a spider, a suspension or an edge, but it is notlimited thereto

In one example, one end of the damper 537 may be connected to the edgeframe 536 and the other end of the damper 537 may be connected to theupper outer surface of the bobbin 534. The damper 537 may be made of acorrugated structure between one end and the other end to adjust or toabsorb the vibration of the bobbin 534 while shrinking and relaxingaccording to the vertical movement of the bobbin 534. Connecting betweenthe bobbin 534 and the edge frame 536, the damper 537 may limit thevibration distance of the bobbin 534 by the resilient or restoringforce. For example, when the bobbin 534 vibrates over or below certaindistance, the bobbin 534 may return to its original position by theresilience of the damper 537.

In one example, the damper 537 may be made of a metal elementelectrically connected to the coil 535. For example, the damper 537 mayhave a spring structure made of metal material having high elasticity.For example, the damper 537 may be made of a stainless steel or copper,but it is not limited thereto.

In one example, the vibration unit 530 may further include a boobinprotector 538. The bobbin protector 538 may be disposed at the uppersurface (or end portion) of the bobbin 534 to transmit the elevationmovement (or vibration) of the bobbin 534 to the rear surface of thedisplay module 110. For example, the bobbin protector 538 may have aring shape attached at the front surface of the bobbin 534, a disc shapecovering the whole front surface of the bobbin 534 or a cap shapesurrounding the front surface and the upper outer side surface of thebobbin 534. The bobbin protector 538 may be expressed as a bobbin ringor a bobbin upper plate, but it is not limited thereto. In otherexample, one end of damper 537 may be connected to the edge frame 536 orthe base plate 531 and the other end of damper 537 may be connected tothe bobbin protector 538.

The sound generating unit 500 according to the first embodiment of thepresent disclosure may be installed inside the back cover 300 andattached on the rear surface of the display module 100. In one example,the vibration unit 530 configuring the sound generating unit 500 may beattached to the rear surface of the display module 100. In this case,the adhesive element 600 may be disposed between the bobbin protector538 of the vibration unit 530 and the display module 100.

The adhesive element 600 may be a double side tape or a double side formtape, and may include PSA (pressure sensitive adhesive), OCA (opticalclear adhesive) or OCR (optical clear resin), but it is not limitedthereto.

Further, in this case, the upper surface of the bobbin protector 538 inthe vibration unit 530 may be extruded little bit over the top surfaceof the upper substrate 330 of the back cover 300. The display module 100may be vibrated by the elevation movement of the bobbin 534, and thusthe sounds are generated. In this case, only the vibration unit 530 maybe attached to the display module 100, so the vibrating display module100 may collide with the unit housing 510 or the back cover 300 causingnoises. To prevent the noise, the extrusion amount of the bobbinprotector 538 may be higher than the elevation movement range of thebobbin 534.

In another example, the vibration unit 530 configuring the soundgenerating unit 500 and the unit housing 510 may be attached at the rearsurface of the display module 100. In this case, the adhesive element600 may be disposed between the top surface of the bobbin protector 538of the vibration unit 530 and the top surface 513 of the unit housing510.

In still another example, the upper surface of the back cover 300 wherethe sound generating unit 500 is inserted and the upper surface of thesound generating unit 500 may be attached on the rear surface of thedisplay module 100. In this case, the top surface 513 of the unithousing 510 of the sound generating unit 500, the upper surface of thebobbin protector 538 of the vibration unit 530 and the upper surface ofthe upper substrate 330 of the back cover 300 may be disposed on thesame plane. After depositing the adhesive element 600 on the whole rearsurface of the display module 100 and inserting the sound generatingunit 500 into the back cover 300, the back cover 300 is attached at theadhesive element 600. As attaching to the whole rear surface of thedisplay module 100, the back cover 300 may play role of protecting therear surface of the display module 100 and of dissipating the heatgenerated from the display module 100 to out environment.

In the case that the vibration unit 530 and the unit housing 510 areattached to the display module 100 using the adhesive element 600according to the first embodiment, it is preferable that the area of theopening provided in the top surface 513 of the unit housing 510 issufficiently ensured to provide a vibration space surrounding thevibration unit 530 between the unit housing 510 and the display module100. The vibration space may be expressed as a sound pressure space, anecho box, an echo section, a resonance box or a resonance section, butit is not limited thereto.

The display apparatus according to the present disclosure may include atleast one sound generating module disposed at the center portion (ormiddle area) on the rear surface of the display module 100. For example,one sound generating module may vibrate the center portion of the rearsurface of the display module 100 so the sounds PVS by the vibration ofthe display module 100 may be provided.

In another example, the display apparatus may include a first soundgenerating unit and a second sound generating unit, wherein the firstsound generating unit may be disposed at a first area (or left area) ofthe display module 100 with respect to the center of the display module100, and the second sound generating until may be disposed at a secondarea (or right area) of the display module 100. For example, the firstsound generating unit may vibrate a first rear area of the displaymodule 100 to provide the sounds PVS by the vibration of the first reararea of the display module 100. The second sound generating unit mayvibrate a second rear area of the display module 100 to provide thesounds PVS by the vibration of the second rear area of the displaymodule 100. In this case, the display apparatus may provide the stereosounds of 2-channel according to the separation of sounds into left andright components through the first and second sound generating units.The first sound generating unit may be configured to output the leftsounds and the second sound generating unit may be configured to outputthe right sounds.

In one example, at least one sound generating unit 500 may be installedinside the back cover 300 to vibrate the display module 100 and outputthe sounds PVS. As surrounded by the back cover 300, the soundgenerating unit 500 may be concealed without being exposed to theoutermost rear part of the display apparatus. Accordingly, the displayapparatus according to the present disclosure may have a clean backdesign in which the sound generating unit 500 is not shown by users, andthe rear outer design may be improved.

At least one sound generating unit 500 according to one example may beone body structure or single body modulized as one instrument part. Forexample, after being manufactured in the form of a finished product suchas one body structure or a single body by a modular process (or anpre-assembly process), at least one sound generating unit 500 may bemounted or placed inside a compartment 370 of the rear cover 300 by arelatively simple component mounting (or placement) process in theassembly process of the display apparatus. Therefore, according to thepresent disclosure may improve the production yield of the displayapparatus, because of enhanced the assembly efficiency of the soundgenerating unit 500.

Second Embodiment

FIG. 4 is an enlarged cross-sectional view illustrating a structure of adisplay apparatus according to the second embodiment of the presentdisclosure. The display apparatus according to the second embodiment ofthe present disclosure may have the similar structure with the firstembodiment. The difference is that the second embodiment may furtherinclude a resonance opening or resonance path 571 connecting the innerspace of the unit housing 510 and the space of compartment 370 formed inthe back cover 300.

Referring to FIG. 4, the display apparatus according to the secondembodiment of the present disclosure may comprise a display module 100,a back cover 300 and a sound generating unit 500. The sound generatingunit 500 may have a structure for embedding into the back cover 300 andfixed thereto. The display module 100 may be same as that of the firstembodiment, so same explanation will not be duplicated.

The detailed structure of the back cover 300 may be same as that of thefirst embodiment, so same explanation will not be duplicated. When it isnecessary, further explanation is made by referring the first embodimentexplanation.

The sound generating unit 500 may be inserted and fixed into acompartment 370 formed at the back cover 300. The sound generating unit500 may include a unit housing 510 and a vibration unit 530. Thevibration unit 530 may flexed inside the inner space of the unit housing510. Therefore, the unit housing 510 may have sufficient volume toenclosing the vibration unit 530. The detail structure of the vibrationunit 530 may be very similar with that of the first embodiment, soduplicated explanation will be omitted.

The unit housing 510 may include a bottom surface 511, a top surface513, a side surface 515 and a resonance opening 517. The bottom surface511 may be a bottom plate of the unit housing 510 for fixing orinstalling the vibration unit 530 thereon. In addition, the bottomsurface 511 may be fixed inside the back cover 300. The top surface 513may be a top plate facing the bottom surface 511 with a predetermineddistance. The top surface 513 may have an aperture. Through thisaperture, the vibration unit 530 may be installed on or disassembledfrom the bottom surface 511. The side surface 515 may be a side platefor connecting the bottom surface 511 and the top surface 513 forprotecting the inner space of the unit housing 510.

The resonance opening 517 may be a structure formed at the side surface515 for connecting the inner space of the unit housing 510 and the spaceof compartment, so it may be expressed as a resonance pathway. As thevibration unit 530 makes a vibration movement in the unit housing 510,the display module 100 may be vibrated by the bobbin 534 or the bobbinprotector 538 attached at the rear surface of the display module 100.The vibration of the display panel 100 may provide the sound pressure tothe air occupied in the space of the unit housing 510. Accordingly, arich volume of sound may be provided by the resonance occurred inside ofthe unit housing 510.

The circumference of the unit housing 510 may be surrounded by thepartition wall 350 of the back cover 300. That is, the unit housing 510may be enclosed by the inner space of the compartment 370 defined by thepartition wall 350. Therefore, the sounds vibrated inner space of theunit housing 510 may be resonated with the inner space of thecompartment 370, so that further richer sounds may be provided.

The display apparatus according to the second embodiment of the presentdisclosure may further include the resonance opening 517 having apredetermined size at one portion of the side surface 515 of the unithousing 510. Adjusting the position, the diameter and/or the length ofthe resonance opening 517, the sound pressure of the desired bandwidthmay be enhanced or controlled.

In one example, applying Helm Hotz resonator theory, the resonanceopening 517 may control the sound pressure of any desired bandwidth. Forexample, high sound quality may be acquired by selectively enhancing thesound pressure in the high-frequency bandwidth range.

For example, the formula for obtaining resonant frequency by Helm-Holzresonator theory may be as shown in Equation 1 below.

$\begin{matrix}{f = {5410\sqrt{\frac{a}{V\left( {I + {0.8D}} \right)}}\left( {{cm}/\sec} \right)}} & \left\lbrack {{Equation}\mspace{14mu} 1} \right\rbrack\end{matrix}$

Here, ‘f’ refers to the resonant frequency, ‘V’ refers to the volume(cm3) of the space (in the unit housing 510), ‘a’ refers thecross-sectional area (cm2) of the resonance opening, ‘D’ refers to adiameter (cm) of the resonance opening, and ‘I’ refers to the protrudinglength (cm) of the resonance opening 517. The names of the parts may bereferred to FIG. 5. FIG. 5 is a cross-sectional view illustrating astructure in which a unit housing having a resonance opening is insertedinside the back cover of the display apparatus according to the secondembodiment of the present disclosure.

Even though an aperture is formed at the top surface 513 of the unithousing 510, this aperture is closed as the unit housing 510 is attachedto the display module 100 using the adhesive element 600. Therefore, theunit housing 510 has a closed unit housing space SP1. In addition theunit housing 510 is surrounded by the partition walls 350 of the backcover 300 so as that the compartment 370 is also formed as the closedcompartment space SP2. In this case, adjusting the resonance opening 517with the unit housing 510 referring to Equation 1, the sound pressure ofa desired sound frequency bandwidth may be improved or enhanced.

In another case, the upper substrate 330 of the back cover 300 may beseparated from the unit housing 510 by a gap, so that the adhesiveelement 600 may not be applied to the upper surface of the back cover300 and may not be attached to the display module 100. In this case, thecompartment space SP2 may not be closed but form an open space.

Third Embodiment

Hereinafter, referring to FIG. 6, the third embodiment of the presentdisclosure will be explained. FIG. 6 is an enlarged cross-sectional viewillustrating a structure of a display apparatus according to the thirdembodiment of the present disclosure. The display apparatus according tothe third embodiment may have the similar structure with that of thefirst embodiment. The difference is that the display apparatus accordingto the third embodiment may further include a weight element WT in theinner space of the unit housing 510.

Referring to FIG. 6, the display apparatus according to the thirdembodiment of the present disclosure may comprise a display module 100,a back cover 300 and a sound generating unit 500. The sound generatingunit 500 may have a structure of being inserted and fixed into the backcover 300. With the same structure with the first embodiment, thedetailed explanation about the display module 100 will not beduplicated.

The detailed structure of the back cover 300 is also very similar withthe first embodiment, same explanation will not be duplicated. When itis necessary, the description of the first embodiment may be recited tofurther explain.

The sound generating unit 500 may be inserted and fixed into thecompartment 370 formed at the back cover 300. The sound generating unit500 may include a unit housing 510 and a vibration unit 530. Thevibration unit 530 may be fixed inner space of the unit housing 510.Therefore, the unit housing 510 may have sufficient volume for enclosingor mounting the vibration unit 530. The detailed structure of thevibration unit 530 may be very similar with the first embodiment, so theduplicated explain will be omitted.

The unit housing 510 may include a bottom surface 511, a top surface 513and a side surface 515. The bottom surface 511 may be a bottom plate ofthe unit housing 510 for fixing or installing the vibration unit 530thereon. In addition, the bottom surface 511 may be fixed inside theback cover 300. The top surface 513 may be a top plate facing the bottomsurface 511 with a predetermined distance. The top surface 513 may havean aperture. Through this aperture, the vibration unit 530 may beinstalled on or disassembled from the bottom surface 511. The sidesurface 515 may be a side plate for connecting the bottom surface 511and the top surface 513 for protecting the inner space of the unithousing 510.

The weight element WT may be disposed and fixed inside the unit housing510. In one example, the weight element WT may be disposed as a ringshape along the circumference of the bottom surface 511. In anotherexample, the weight element WT may be disposed as a ring shape at theside surface 515. In still another example, the weight element WT may beimplemented as a nut shape at the center portion of the bottom surface511, and the base plate 531 of the vibration unit 530 may be screwed andtightened to the nut. When necessary, the weight element WT may bedisposed at the corner portion where the top surface 513 meets the sidesurface 515 in the unit housing.

The weight element WT may increase the total weight of the unit housing510. As the vibration unit 530 fixed to the unit housing 510 vibratesthe display module 100, the movement of the vibration unit 530 may begenerated from the elevation movement of the bobbin 534. The momentum ofthe elevation movement of the bobbin 534 may be decided with respect tothe base plate 531. Since the base plate 531 is fixed to the unithousing 510, the momentum of the elevation movement of the bobbin 534may be decided with respect to the unit housing 510.

In order to accurately maintain the movement of the bobbin 534, it ispreferable for a base element of the movement to maintain in arelatively fixed state. That is, it is preferable that the unit housing510 or the base plate 531 is configured to maintain in a relativelyfixed state with respect to the bobbin 534, which is advantageous forensuring good sound quality. As further including the weight element WTinside the unit housing 510, the third embodiment provides theconfiguration in which the unit housing 510 may be maintained in arelatively fixed state with respect to the bobbin 534.

FIG. 6 illustrates a case in which the unit housing 510 does not includethe resonance opening 517. However, in the case that the resonanceopening 517 is included as shown in FIG. 4 or 5, the weight element WTmay be further applied. In this case, the position of the weight elementWT may be arranged at any position inside the unit housing 510, asdescribed above, as long as the resonance opening 517 is not blocked.

Hereinafter, referring to FIG. 7, the compartment 370 and the unithousing 510 mounted on the compartment 370 will be explained in oneexample of the display apparatus according to the present disclosure.FIG. 7 is a perspective view illustrating one example of a shape of achamber and a unit housing installed in the chamber, according to thepresent disclosure. The specific shape and structure of the displayapparatus according to the present disclosure may be not limited to FIG.7 and may include all structures and shapes that can be modified withreference to this. In addition, the shape and structure of thecompartment 370 and the unit housing 510 according to FIG. 7 may beapplied to all the embodiments described above.

Referring to FIG. 7, tin the display apparatus according to the presentdisclosure, the back cover 300 may include a lower substrate 310 and aplurality of partition walls 350 disposed on the lower substrate 310.Further, an upper substrate 330 may be disposed on the partition wall350, but it is not shown in convenience of explanation. In addition,although the partition walls may be continuously arranged on the wholesurface of the lower substrate 310, for convenience of explanation, setsof partition walls 350 forming compartments 370 are illustrated in FIG.7.

By the plurality of partition walls 350, a plurality of compartments 370a and 370 b may be defined. Here, the compartments 370 a and 370 b areillustrated as having a regular octagon shape. However, it is notlimited thereto but have various polygon shapes.

The unit housing 510 may be installed and fixed inside each of thecompartments 370 a and 370 b. Like the left compartment 370 a shown inFIG. 7, each compartment may have one unit housing 510. In some cases,like the right compartment 370 b shown in FIG. 7, one compartment mayhave at least two unit housings 510 a and 510 b.

When including at least two unit housing 510 a and 510 b in onecompartment, they may be arranged spaced with certain distance from eachother, but they may be arranged in close contact with each other. Eachof unit housings 510 a and 510 b may have one vibration unit (not shownin figure), respectively. In this case, each of vibration units (notshown) may be vibration devices those generate sound vibrations ofdifferent frequency bandwidths each other.

In one example, the unit housing 510 may have the same shape with thecompartment 370. Otherwise they may have different shape each other.FIG. 7 illustrates that the unit housing 510 has a rectangular shapedifferent from the shape of compartment 370. However, it is not limitedthereto, but has various shapes.

In one example, the unit housing 510 may further include a resonanceopening 518. As shown in FIG. 7, each of two unit housings 510 a and 510b may have one resonance opening, respectively. For example, a firstresonance opening 517 a may be provided in the first unit housing 510 ain which a vibration unit (not shown) generating a high frequencybandwidth sound may be installed. Further, a second resonance opening517 b may be provided in the second unit housing 510 b in which avibration unit (not shown) generating a low frequency bandwidth soundmay be installed.

The size of each part may be determined with reference to Equation 1 sothat the first unit housing 510 a and the first resonance opening 517 amay be satisfied with a condition capable of resonating with respect tothe frequency of the treble bandwidths. As well, the size of each partmay be determined with reference to Equation 1 so that the second unithousing 510 b and the second resonance opening 517 b may be satisfiedwith a condition capable of resonating with respect to the frequency ofthe bass bandwidths.

As shown in FIG. 7, the direction of the resonance openings 517 a and517 b may be faced in opposite directions to each other. However, it isnot limited thereto. They may be arranged in a “V” shape or “11” shape.

Hereinafter, referring to FIG. 8, the compartment 370 and the unithousing 510 mounted on the compartment 370 will be explained in anotherexample of the display apparatus according to the present disclosure.FIG. 8 is a plane view illustrating one example of a shape of a chamberand a unit housing installed in the chamber, according to the presentdisclosure. As the structure of the unit housing provided in thecompartment may be more complicated than the examples described above,FIG. 8 illustrates a plane view for convenience of understanding. Thereference numerals that do not appear in the drawings may refer to thenumerals in the preceding drawings.

The specific shape and structure of the display apparatus according tothe present disclosure may be not limited to FIG. 8 and may include allstructures and shapes that can be modified with reference to this. Inaddition, the shape and structure of the compartment 370 and the unithousing 510 according to FIG. 8 may be applied to all the embodimentsdescribed above.

Referring to FIG. 8, tin the display apparatus according to the presentdisclosure, the back cover 300 may include a lower substrate 310 and aplurality of partition walls 350 disposed on the lower substrate 310.Further, an upper substrate 330 may be disposed on the partition wall350, but it is not shown in convenience of explanation. In addition,although the partition walls may be continuously arranged on the wholesurface of the lower substrate 310, for convenience of explanation, setsof partition walls 350 forming compartments 370 are illustrated in FIG.8.

The compartment 370 may be defined as a space surrounded by thepartition walls 350. Here, in convenience, the compartment 370 isillustrated as a rectangular shape in a plan view. However, it is notlimited thereto, but it may have any shape including various polygon,circle or ellipse.

Inside of the compartment 370, at least one unit housing 510 may bedisposed. In FIG. 8, three unit housings 510 are disposed. In detail, atreble unit housing 510T for high frequency bandwidth sound, a mid unithousing 510M for middle frequency bandwidth sound and a bass unithousing 510W for low frequency bandwidth sound may be included. However,it is not limited thereto, but more sub unit housings may be furtherincluded.

The treble unit housing 510T may include a treble bottom surface (notshown), a treble top surface (not shown), a treble side surface 515T anda treble resonance opening 517T. As FIG. 8 illustrates a plan view, itshows the treble side surface 515T and the treble resonance opening517T. The treble side surface 515T may have a first thickness.Considering the volume of the treble unit housing 510T, the trebleresonance opening 517T may have a cross-sectional area, a diameter and aprotrusion length defined by Equation 1. The treble resonance opening517T may link the compartment 370 to the inner space of the treble unithousing 510T. In the inner space of the treble unit housing 510T, atreble vibration unit 530T may be disposed.

The mid unit housing 510M may include a mid bottom surface (not shown),a mid top surface (not shown), a mid side surface 515M and a midresonance opening 517M. As FIG. 8 illustrates a plan view, it shows themid side surface 515M and the mid resonance opening 517M. The mid sidesurface 515M may have a second thickness. Considering the volume of themid unit housing 510M, the mid resonance opening 517M may have across-sectional area, a diameter and a protrusion length defined byEquation 1. The mid resonance opening 517M may link the compartment 370to the inner space of the mid unit housing 510M. In the inner space ofthe mid unit housing 510M, a mid vibration unit 530M may be disposed.

The bass unit housing 510W may include a bass bottom surface (notshown), a bass top surface (not shown), a bass side surface 515W and abass resonance opening 517W. As FIG. 8 illustrates a plan view, it showsthe bass side surface 515W and the bass resonance opening 517W. The bassside surface 515W may have a third thickness. Considering the volume ofthe bass unit housing 510W, the bass resonance opening 517W may have across-sectional area, a diameter and a protrusion length defined byEquation 1. The bass resonance opening 517W may link the compartment 370to the inner space of the bass unit housing 510W. In the inner space ofthe wofr unit housing 510W, a bass vibration unit 530W may be disposed.

In FIG. 8, the treble unit housing 510T may have the smallest innerspace, the bass unit housing 510W may have the largest inner space andthe mid unit housing 510M may have a medium inner space. This is anexample in which the frequency bandwidth is designed in consideration ofhaving characteristics of high, medium and low depending on the size ofthe vibration space, each unit housing.

For easiness of design, the bass unit housing 510W and the mid unithousing 510M may have the same shape and outer size. In order to havedifferent volume of the inner space, the second thickness of the midside surface 515M of the mid unit housing 510M may be thickener than thethird thickness of the bass side surface 515W of the bass unit housing510W. The first thickness of the treble side surface 515T of the trebleunit housing 501T may be same with any one of the second thickness andthe third thickness. Adjusting the first to third thicknesses, it isfreely designing the inner spaces of the treble unit housing 510T, themid unit housing 510M and the bass unit housing 510W, respectively.

As the treble resonance opening 517T, the mide resonance opening 517Mand the bass resonance opening 517W may be calculated by Equation 1,they may have different space, respectively. Further, the directions ofeach resonance openings 517T, 517M and 517W may be differently arranged.For example, as shown in FIG. 8, they may be facing differentdirections, respectively. For another example, they may be disposed ashaving 120 degrees between each direction of the resonance openings.

The treble vibration unit 530T may generate a sound vibration havinghigh frequency bandwidth. The mid vibration unit 530M may generate asound vibration having middle frequency bandwidth. The bass vibrationunit 530W may generate a sound vibration having low frequency bandwidth.The treble vibration unit 530T may have the smallest size, and the bassvibration unit 530W may have the largest size. Further, the midvibration unit 530M may have a middle size between the treble vibrationunit 530T and the bass vibration unit 530W.

In addition, the compartment 370 surrounding the treble unit housing510T, the mid unit housing 510M and the bass unit housing 510W may havevarious shapes by taking into account the interaction with eachresonance openings 517T, 517M and 517W. Although having a simple squareshape as shown in FIG. 8, the compartment 370 may be formed in variousshapes such as an oval shape and a cloud shape for adjusting theefficiency of each of the resonance openings 517T, 517M and 517W.

Features, structures, effects and so on described in the above describedexamples of the present disclosure are included in at least one exampleof the present disclosure, and are not necessarily limited to only oneexample. Furthermore, features, structures, effects and so onexemplified in at least one example of the present disclosure may beimplemented by combining or modifying other examples by a person havingordinary skilled in this field. Therefore, contents related to suchcombinations and modifications should be interpreted as being includedin the scope of the present application.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present disclosurewithout departing from the spirit or scope of the disclosures. Thus, itis intended that the present disclosure covers the modifications andvariations of this disclosure provided they come within the scope of theappended claims and their equivalents. These and other changes can bemade to the embodiments in light of the above-detailed description. Ingeneral, in the following claims, the terms used should not be construedto limit the claims to the specific embodiments disclosed in thespecification and the claims, but should be construed to include allpossible embodiments along with the full scope of equivalents to whichsuch claims are entitled. Accordingly, the claims are not limited by thedisclosure.

What is claimed is:
 1. A display apparatus comprising: a display module;a back cover disposed at a rear surface of the display module; acompartment provided inside the back cover; a fixing element providedinside the compartment; a sound generating unit inserted into thecompartment and installed by the fixing element; and an adhesive elementattaching an upper surface of the sound generating unit and the rearsurface of the display module, wherein the back cover includes: an uppersubstrate facing to the rear surface of the display module; a lowersubstrate apart from the upper substrate with a predetermined distance;and a plurality of partition walls disposed between the upper substrateand the lower substrate, wherein the compartment is defined by the uppersubstrate, the lower substrates and at least one partition wall, andwherein a bottom surface of the compartment is joined with bottom of thesound generating unit by the fixing element.
 2. The apparatus accordingto claim 1, wherein the sound generating unit is inserted into thecompartment from a top surface of the compartment.
 3. The apparatusaccording to claim 2, wherein the sound generating unit include: a unithousing; and a vibration unit mounted inside the unit housing, andwherein an upper surface of the vibration unit is attached to the rearsurface of the display module by the adhesive element.
 4. The apparatusaccording to claim 3, further comprising: a resonance path connecting aninner space of the unit housing and the compartment.
 5. The apparatusaccording to claim 3, further comprising: a weight element attachedinside the unit housing.
 6. The apparatus according to claim 3, whereinthe adhesive element is formed overall of the rear surface of thedisplay module, and an upper surface of the unit housing, an uppersurface of the vibration unit and a top surface of the upper substrateof the back cover are attached to the display module by the adhesiveelement.
 7. The apparatus according to claim 3, wherein an upper surfaceof the unit housing is disposed at a same level with or at higher levelfrom an upper surface of the upper substrate, and wherein the adhesiveelement is deposited on the upper surface of the unit housing and theupper surface of the vibration unit.
 8. A display apparatus comprising:a sound generating unit including a vibration unit installed in a unithousing; a back cover including a compartment where the sound generatingunit is inserted, and a fixing element provided inside the compartment;and a display module disposed at a top surface of the back cover andattached to an upper surface of the vibration unit, wherein the backcover includes: an upper substrate; a lower substrate facing the uppersubstrate with a predetermined distance; and a plurality of partitionwalls disposed between the upper substrate and the lower substrate,wherein the compartment is defined by the upper substrate, the lowersubstrate and at least one partition wall, wherein the sound generatingunit inserted in the compartment through a mounting hole formed byremoving some of the upper substrate, and wherein the sound generatingunit is installed at the lower substrate by the fixing element.
 9. Theapparatus according to claim 8, wherein the display module includes: adisplay panel including a display area and a non-display areasurrounding the display area; a functional film disposed at an outerupper surface of the display panel; and a heat dissipate elementdisposed at a rear surface of the display panel, and wherein furthercomprising: an adhesive element attaching the upper surface of thevibration unit to the heat dissipate element.
 10. The apparatusaccording to claim 8, further comprising: a guide panel surroundingsides of the back cover and the display module, and assembling the backcover with the display module.
 11. The apparatus according to claim 8,wherein the sound generating unit further includes: a weight elementinstalled at circumference of the vibration unit inside the unithousing.
 12. The apparatus according to claim 8, wherein the unithousing includes: a bottom surface; a top surface facing the bottomsurface and having an aperture; and a side surface connecting the bottomsurface and the top surface, and wherein the vibration unit is installedon the bottom surface.
 13. The apparatus according to claim 12, whereinthe unit housing further includes: a resonance opening formed at oneportion of the side surface for exposing an inner space of the unithousing.
 14. The apparatus according to claim 8, wherein the vibrationunit includes: a base plate having vessel shape and fixed inside theunit housing; a magnet having a cylindrical shape and fixed at a centerportion of the base plate; a bobbin apart from the magnet andsurrounding the magnet; a coil surrounding the outer circumference ofthe bobbin; a bobbin protector attached at the upper portion of thebobbin; and a damper connecting at least one of the bobbin and thebobbin protector to the base plate, and wherein an upper surface of thebobbin protector is attached to the display module.
 15. The apparatusaccording to claim 5, wherein the compartment has any one shape, in aplan view, of a square, a rectangle, a regular hexagon, a regularoctagon, a circle and an oval.
 16. The apparatus according to claim 5,further comprising: a resonance path connecting an inner space of theunit housing and a space of the compartment.